Need to make it stop

Using Arduino Displays
1

Hi all,

I have been having problem with with TFT LCD for 2 days now, I looked through so many example codes and searched every site and googled with different sentences with no luck.

So, I wrote a code to my TFT LCD and it shows what I wanted it to show but it won't stay put, its just flickering(don't know if this is the write word). I attached a video of the TFT LCD and the code.

I need your help.

#include <Adafruit_GFX.h>    // Core graphics library
#include "SWTFT.h" // Hardware-specific library

#define LCD_CS A3 // Chip Select goes to Analog 3
#define LCD_CD A2 // Command/Data goes to Analog 2
#define LCD_WR A1 // LCD Write goes to Analog 1
#define LCD_RD A0 // LCD Read goes to Analog 0
#define LCD_RESET A4 // Can alternately just connect to Arduino's reset pin

#define	BLACK   0x0000
#define	BLUE    0x001F
#define	RED     0xF800
#define	GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF

SWTFT tft;
double value;
double value1;

void setup() 
{
     tft.reset();
     tft.begin();
     
     tft.fillScreen(BLUE);
     value=analogRead(A5)*(3.0/1023.0);
     value1=analogRead(A6)*(3.0/1023.0);
}

void loop()
{
    tft.fillScreen(BLUE);
    
    tft.drawRoundRect(10, 20, 100, 50, 5, WHITE);
    tft.fillRoundRect(10, 20, 35, 50, 5, WHITE);
    
    tft.setCursor(20, 35);
    tft.setTextColor(BLUE);
    tft.setTextSize(3);
    tft.setTextWrap(1);
    tft.print("V");
    
    tft.setCursor(55, 35);
    tft.setTextColor(WHITE);
    tft.setTextSize(2);
    tft.setTextWrap(1);
    tft.print(value);
    
    tft.drawRoundRect(135, 20, 100, 50, 5, WHITE);
    tft.fillRoundRect(135, 20, 35, 50, 5, WHITE);
    
    tft.setCursor(145, 35);
    tft.setTextColor(BLUE);
    tft.setTextSize(3);
    tft.setTextWrap(1);
    tft.print("T");
    
    tft.setCursor(180, 35);
    tft.setTextColor(WHITE);
    tft.setTextSize(2);
    tft.setTextWrap(1);
    tft.print(value1);
    
    tft.drawRoundRect(10, 85, 100, 50, 5, WHITE);
    tft.fillRoundRect(10, 85, 35, 50, 5, WHITE);
    
    tft.drawRoundRect(135, 85, 100, 50, 5, WHITE);
    tft.fillRoundRect(135, 85, 35, 50, 5, WHITE);
    //return;
    //delay(2000);
}

20140805_203429.mp4 (860 KB)

2

You're continuously writing to the display as fast as possible.
How about writing one time, then wait for something to happen that indicates something has changed that needs a screen update?

3

Thanks CrossRoad

The problem is even if I take out all the analog readings or anything that is/are meant to change values it still does thesame thing like this attached video and code which is just shapes that are not changing.

#include <Adafruit_GFX.h>    // Core graphics library
#include "SWTFT.h" // Hardware-specific library

#define LCD_CS A3 // Chip Select goes to Analog 3
#define LCD_CD A2 // Command/Data goes to Analog 2
#define LCD_WR A1 // LCD Write goes to Analog 1
#define LCD_RD A0 // LCD Read goes to Analog 0
#define LCD_RESET A4 // Can alternately just connect to Arduino's reset pin

#define	BLACK   0x0000
#define	BLUE    0x001F
#define	RED     0xF800
#define	GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF

SWTFT tft;
double value;
double value1;

void setup() 
{
     tft.reset();
     tft.begin();
     
     tft.fillScreen(BLUE);
     /*value=analogRead(A5)*(3.0/1023.0);
     value1=analogRead(A6)*(3.0/1023.0);*/
}

void loop()
{
    tft.fillScreen(BLUE);
    
    tft.drawRoundRect(10, 20, 100, 50, 5, WHITE);
    tft.fillRoundRect(10, 20, 35, 50, 5, WHITE);
    
    /*tft.setCursor(20, 35);
    tft.setTextColor(BLUE);
    tft.setTextSize(3);
    tft.setTextWrap(1);
    tft.print("V");
    
    tft.setCursor(55, 35);
    tft.setTextColor(WHITE);
    tft.setTextSize(2);
    tft.setTextWrap(1);
    tft.print(value);*/
    
    tft.drawRoundRect(135, 20, 100, 50, 5, WHITE);
    tft.fillRoundRect(135, 20, 35, 50, 5, WHITE);
    
    /*tft.setCursor(145, 35);
    tft.setTextColor(BLUE);
    tft.setTextSize(3);
    tft.setTextWrap(1);
    tft.print("T");
    
    tft.setCursor(180, 35);
    tft.setTextColor(WHITE);
    tft.setTextSize(2);
    tft.setTextWrap(1);
    tft.print(value1);*/
    
    tft.drawRoundRect(10, 85, 100, 50, 5, WHITE);
    tft.fillRoundRect(10, 85, 35, 50, 5, WHITE);
    
    tft.drawRoundRect(135, 85, 100, 50, 5, WHITE);
    tft.fillRoundRect(135, 85, 35, 50, 5, WHITE);
    //return;
    //delay(2000);
}

20140805_205958.mp4 (464 KB)

4

You keep filling the screen with the color blue.

void loop()
{
tft.fillScreen(BLUE);

tft.drawRoundRect(10, 20, 100, 50, 5, WHITE);
tft.fillRoundRect(10, 20, 35, 50, 5, WHITE);
.
.
.
}

Put that line in the setup() function.
Actually anything that doesn't need to be constantly redrawn on the screen should be put in the setup() function too.

5

Thank you Thank you HazardMind and CrossRoads

It stopped

just the way I want it

6

Nice, the problem is solved.

Do you understand why ?